KR20000006056U - Flow control valve with noise chamber of power steering steering pump - Google Patents

Abstract

The present invention is inserted into and fixed to one side end of the housing (3) forming the outer body, the housing 3 to form a space portion 10 in which the discharge port (11) and the supercharge port (12) communicate with the communication hole in the axial direction A union fitting 20 through which 22 is formed and a communication hole 15 communicate with the union fitting 20 and are elastically supported on the opposite side of the union fitting 20 by a valve spring 60. In the flow control valve (1) of the power steering steering pump composed of a control valve (50), the housing (3) between the rear wall of the control valve (50) side and the outlet (33) of the communication pipe (15). A through hole 35 is formed on the wall surface of the bore 31, and the through hole 35 is fitted with a noise chamber 39 in which a cushioning material 37 is fitted in a direction perpendicular to the through hole 35. Flow control valve for power steering steering pump The noise chamber is inserted into the wall between the control valve opposing wall and the communication tube outlet in the rear wall of the valve bore inside the valve housing so that the relief pressure acting on the rear of the control valve is attenuated, resulting in vibration. The noise caused by this is to be reduced.

Description

Flow rate controlling valve provided with silencing chamber of power steering hydraulic pump

The present invention relates to a flow control valve of a power steering steering pump, and more particularly, the hydraulic pressure of the hydraulic oil supplied from the steering pump to the power steering device through the flow control valve from the steering pump for power steering of the vehicle. Relief that occurs when the valve screw and the ball of the control valve are released when the excessive system hydraulic pressure is generated in the flow control valve to protect the flow control valve. Flow control with a noise chamber of the power steering steering pump to attenuate the pulsation of the relief pressure applied to the control valve through the communicating tube by forming a noise chamber adjacent to the valve to prevent the occurrence of chattering noise. It is about a valve.

In general, the hydraulic power steering device increases hydraulic power from the oil pump installed in the middle of the steering linkage connected to the steering wheel by means of the power steering gear and applies the steering wheel (front wheel) through the output shaft to increase steering power. It also enables light and quick steering even by force.

This power steering device is composed of a power means for generating hydraulic pressure, an operating means for generating a steering force by converting the generated hydraulic pressure into a mechanical force, and a control means for controlling the operation direction and state of the working cylinder through opening and closing of the flow path. In addition, the steering wheel ratio by the driver is reduced so that the steering gear ratio can be freely selected, and the kickback phenomenon that the shock is transmitted to the steering wheel through the front wheel from the road surface is prevented, and the simimmotion by the vibration of the front wheel is possible. It has the characteristic of attenuating (shimmy motion).

A typical example of such a power steering device is illustrated in FIG. 1, which is briefly described as follows.

As shown, a general conventional power steering apparatus is composed of a steering pump 101 as a power means, a power cylinder 104 as an operation means, and a power gear control valve 105 as a control means. Here, the steering pump 101 is configured to generate hydraulic pressure by forcibly discharging the oil from the leisure bore 102 through the intake hose 102a while rotating by receiving the power of the engine. In the power cylinder 104, a piston (not shown) forming two chambers is connected to both front wheels 109 via tie rods 106 so as to transmit hydraulic pressure from the steering pump 101 to the wheel side. . In addition, the power gear control valve 105 supplies the hydraulic pressure transmitted from the steering pump 101 to the pressure hose 101a to the corresponding chamber of the power cylinder 104 according to the rotation angle of the steering shaft 107 and the oil of the other chamber. It is to be discharged to the leisure bore 102 through the return hose (103).

Accordingly, when the engine is driven, the steering pump 101 rotates synchronously to suck oil from the leisure bore 102 to form hydraulic pressure on the pressure hose 101a. For example, the power gear control valve 105 is a rotary valve. In one case, when the driver turns the steering wheel 108 to one side, the physical force is transmitted to the steering shaft 107 to twist the torsion bar (not shown) in the power gear control valve 105. Accordingly, the chamber of the power cylinder 104 corresponding to the rotation direction of the steering wheel 108 is connected to the pressure hose 101a connected to the steering pump 101 while the power gear control valve 105 is rotated by the torsion bar. The other chamber is opened with a return hose 103 connected with the leisure bore 102.

Accordingly, the chamber of the power cylinder 104 communicated with the pressure hose 101a by the power gear control valve 105 is expanded by moving the piston while the oil is introduced, and the chamber on the opposite side is contracted by the movement of the piston. The oil is discharged to the leisure bore 102 through the return hose (103). At this time, the moving piston changes the advancing angle of the front wheel 109 while operating the tie rod 108 by hydraulic pressure to perform power steering.

As shown in FIG. 2, the steering pump 101 in the power steering device as described above has a drive shaft DS that receives power from the engine in the center of the housing H so as to be interlocked with a plurality of vanes. The upper part is provided with a flow control valve (V) for adjusting the flow rate of the oil discharged while being sucked through the intake hose (102a) from the leisure bore as the vane rotates.

Figure 3 shows an example of such a conventional flow control valve (V), the upper end of the housing (H) is formed with a cylindrical space portion 110 with one end open to the outside, the center of the steering pump The supercharge port 112 and the discharge port 111 are in communication with the partition 113 therebetween.

The union fitting 120 having the outlet hole 121 formed in the longitudinal direction is fastened to the open portion of the space 110, and a communication hole is formed at one end of the outlet hole 121 located inside the space 110. 122) is formed, and the pressure hose is connected to the other end in communication.

On the opposite side of the union fitting 120 of the space portion 110, a control valve 150 having two large diameter portions 151 and 152 in close contact with the inner circumferential surface of the space portion 110 at an end portion and a stop portion is provided in the front-rear direction. It is inserted in a reciprocating motion, and the large end portion 151 of the end portion is configured to open and close the supercharge port 112 and the discharge port 111 while contacting the rear portion, that is, the right end portion of the union fitting 120. In addition, one side of the control valve 150 is provided with a valve spring 160 for operating the valve 150 toward the union fitting 120. In addition, the space portion 110 of the outlet hole 121 side of the union fitting 120 and the space in which the valve spring 160 is installed are communicated by a communication hole 115.

Here, as shown in the disassembled state in FIG. 4, the control valve 150 has a valve bleed hole 153 communicating with one side between the two large diameter portions 151 and 152, and a relief communicated with the inside and the outside on the opposite side. A valve screw 154 having a pipe 154a is fastened, and a ball 155 and a relief spring 156 and a ball pressurizing the ball 155 to the relief pipe 154a inside the relief pipe 154a. A ball guide 157 is provided which restricts the movement of 155 to form one relief valve structure.

Accordingly, when the hydraulic force is returned from the power steering device through the pressure hose again by the reaction force of the power cylinder, the returned hydraulic pressure is controlled through the communication tube 115 communicating with the outlet hole 121 of the union fitting 120. The back of the valve 150 and the valve spring 160 is introduced into the space portion is located, the hydraulic pressure of the ball 155 closing the relief pipe 154a of the valve screw 154 fastened to the control valve 150 Will be pushed. At this time, the ball 155 is pushed in while compressing the relief spring 156 to open the relief pipe 154a, and the hydraulic fluid passes through the relief pipe 154a and the space portion 110 through the valve bleed hole 153. That is, it is discharged into the space between the two large diameter parts 151 and 152 of the control valve 150 and flows into the suction port of the steering pump through the boosting port 112, and in this process, the hydraulic pressure is returned to the normal pressure again. The mask ball 155 closes the screw relief pipe 154a by the elasticity of the relief spring 156.

By the way, the conventional steering pump flow control system (V) as described above is the communication pipe 115 when the excessive system back (system-back) pressure from the power steering device acts on the space 110 through the union fitting 120 Through this, the hydraulic pressure acting on the rear surface of the valve 150, that is, the right end surface in the drawing is increased. Accordingly, the relief pipe 154a of the valve screw 154 inserted behind the valve 150 is opened to prevent damage to the steering system V, and the ball 155 pushed by hydraulic pressure when the pressure release ends. This relief pipe 154a is closed again.

Since such a relief operation is performed for a short time, when the relief tube 154a is closed, the ball 155 momentarily collides with the relief tube 154a, which is shaken between the ball 155 and the outlet of the relief tube 154a. (chattering) occurs, there was a problem to amplify the relief noise.

The present invention has been made to solve the problems of the conventional flow control valve as mentioned above, by installing a noise chamber on the control valve rear side of the valve bore to form a space inside the housing of the flow control valve to connect the communication pipe The purpose of the present invention is to reduce the relief noise of the valve relief pipe and the ball caused by the excessive pressure waves acting on the valve back, to reduce the relief noise, and to extend the life of the flow control valve and to improve the quality. have.

1 is a schematic perspective view of a general power steering apparatus.

Figure 2 is a side view showing a steering pump of the power steering device shown in FIG.

Figure 3 is a longitudinal sectional view showing an example of a flow control valve mounted on a conventional steering pump.

4 is an exploded longitudinal cross-sectional view of the control valve shown in FIG. 3.

Figure 5 is a longitudinal cross-sectional view of the flow control valve according to an embodiment of the present invention.

6 is an exploded longitudinal sectional view of the control valve shown in FIG. 5;

Figure 7 is a longitudinal sectional view of the flow control valve according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: Flow control valve 3: Housing

11: discharge port 12: supercharge port

15: communicating tube 20: union fitting

37: cushioning material 39,239: noise chamber

41: chamber body 43,243: distribution hole

47: sealing plate 50: control valve

51,52: Large diameter 53: bleed hole

54 valve screw 54a relief tube

55: relief ball 56: relief spring

In order to achieve the above object, the present invention provides a housing that forms an outer body to form a space in which the discharge port and the supercharged port communicate with each other, the union fitting is inserted into one end of the housing and the communication hole penetrates in the axial direction, and through the communication tube A flow regulating valve of a power steering steering pump composed of a control valve in communication with a union fitting and elastically supported on an opposite side of a union fitting by a valve spring, wherein the wall of the housing bore between the rear wall of the control valve side and the outlet of the communication tube is provided. The through-hole is formed, and the through-hole is to provide a flow control valve of the power steering steering pump is fitted with a noise chamber fitted with a cushioning material in a direction perpendicular to the through-hole.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 5, the flow control valve 1 according to an embodiment of the present invention has a configuration that is generally similar to that of a conventional general steering pump flow control valve. That is, the inner space part in contact with and detachable from the housing 3 which largely forms the outer body, the union fitting 20 inserted into the power steering device side of the inner space part 10 of the housing, and the union fitting 20. It consists of the control valve 50 inserted in the 10 so that reciprocation is possible.

The housing 3 has a charging port 12 and a discharge port 11 connected to the steering pump on the sidewalls, the union fitting 20 mounted on the opening of the steering apparatus side, and the control valve mounted on the opposite side thereof. The relief pipe 15 which communicates the space part 10 which the bore 31 of the housing 3 into which 50 is inserted is made is formed in the side wall. In addition, the control valve 50, which is movably inserted into the space 10, is elastically supported by the valve spring 60, and thus the supercharge port 12 reciprocates in the space 10 of the housing 3. ) And the discharge port 11 to open and close to adjust the flow rate of the working oil.

In addition, the flow regulating valve 1 according to the present invention has a through hole 35 formed in a state facing the control valve 50 on the rear surface of the housing bore 31, that is, the right end surface of FIG. 5. The noise chamber 39 is screwed to the ball 35. Therefore, the noise chamber 39 is configured to disperse shock waves (ripple) due to excessive pressure of oil applied to the rear surface of the control valve 50 through the communication pipe 15, and to form an outer body of the chamber body 41. ), A flow hole 43 for fluidly connecting the interior of the chamber body 41 and the space 10, a buffer material 37 inserted and mounted on the opposite side of the flow hole 43 inside the chamber body 41, and It consists of the sealing plate 47 which is inserted and fixed to the outer side of the buffer material 37 so that the chamber body 41 may be sealed.

Here, the noise chamber 39 according to the first embodiment is inserted into the through hole 35 formed in the rear surface of the housing 3, as shown in FIG. 5, and thus the flow chamber formed in the same direction as the through hole 35. The ball 43 has a positional relationship perpendicular to the outlet 33 of the communication pipe 15 similarly to the relief pipe 54a of the control valve 50 shown in FIG. In addition, the buffer material 37, such as a rubber form (rubber form) inside the chamber body 41 is inserted and mounted at right angles to the distribution hole 43 so as to damp the pressure wave transmitted through the distribution hole 43. In addition, the sealing plate 47 sealingly inserted outside the shock absorbing material 37 may be screwed to the inner circumferential surface of the chamber body 41 so as to support the shock absorbing material 37 against the pressure transmitted through the flow hole 43. .

The flow control valve 1 of the present invention also has a control valve 50 having the same structure as a conventional control valve as shown in the disassembled state in FIG. 6, so that the valve 50 is a union fitting 20. Large diameter portions 51 and 52 protrude from the end and the outer peripheral surface of the middle side, and between the large diameter portions 51 and 52, a bleed hole 53 for fluidly connecting the inside and the outside of the valve 50 is formed therethrough. have. And the valve screw 54 which communicates in and out by the relief pipe | tube 54a is fastened to the opening part on the opposite side of the bleed hole 53, and the ball seat 57 is located in front of the bleed hole 53 side of the valve screw 54. Is formed, the ball seat 57 is seated on the ball 55 for opening and closing the relief pipe (54a), the ball 55 is ball by the relief spring 56 fitted around the ball seat (57) The sheet 57 is elastically supported.

7 shows a flow control valve 201 according to a second embodiment of the present invention. The flow regulating valve 201 has the same configuration as the flow regulating valve 1 of the first embodiment except that the noise chamber 239 is inserted through the upper end of the side wall of the valve housing 3. The outlet end of the circulation hole 243 of the chamber 239 is formed in the same direction as the outlet of the communication tube 15.

Therefore, according to the flow control valve (1) according to the embodiment of the present invention, when the hydraulic force is supplied to the power steering device from the steering pump and then the hydraulic force is transmitted to the flow control valve (1) through the pressure hose due to the reaction force of the power cylinder When the generated hydraulic pressure exceeds an appropriate level, the rear surface of the control valve 50 and the space in which the valve spring 60 is positioned through the communication tube 15 communicating with the outlet hole 22 of the union fitting 20 ( The oil introduced into 10 acts on the ball 55 through the relief pipe 54a of the control valve 50 to overcome the repulsive force of the relief spring 56 and flows into the valve 50 and then bleeds the hole 53. Relief action of the valve (1) is achieved by exiting to the charging port (12) through.

At this time, even if the pressure wave of the oil exiting the communication pipe 15 is excessively increased, the pressure wave of the oil is dispersed into the control valve 50 and the noise chamber 39, and the damped pressure wave is the ball 55 of the valve 50. ) Is transmitted to the shock absorbing material 37 through the distribution hole 43 of the noise chamber 39, so that the shaking phenomenon caused by collision with the ball seat 57 in accordance with the pressure change acting on the ball 55 Can be significantly reduced.

In addition, the number of vanes of the steering pump is equal to the number of vanes of the steering pump on the rear surface of the control unit 50 and the space 10 where the valve spring 60 is located through the communication pipe 15 and supplied to the valve 1 from the steering pump. Even if a pulsating pressure wave is applied, the impact of the pressure wave is distributed and transmitted to the noise chamber 39 and the control valve, so that it is possible to significantly reduce the relief noise due to the shaking of the control valve.

As described so far, according to the steering pump flow control valve of the present invention, even if excessive pressure acts on the rear surface of the control valve reciprocally installed in the valve bore inside the flow control valve housing, a part of the pressure is removed from the noise chamber. Absorption attenuation significantly reduces the pressure of the oil discharged through the valve, thereby preventing vibration of the relief ball and valve screw due to the action of excessive pressure, thereby reducing the relief noise caused by the vibration.

Therefore, it is possible to solve the inconvenience in use due to the operation noise of the flow control valve and at the same time it is possible to prevent the shortening of the life of the valve due to the wear of the ball and screw and to improve the quality of the product. In addition, it is possible to eliminate the relief noise of the valve by the use of a simple noise chamber, so that the production and maintenance of the valve can be economically and easily achieved. In addition, since the mounting position of the noise chamber can be set in various ways as in the second embodiment, the assemblability can be greatly increased during mounting.

Although the present invention has been shown and described with respect to particular embodiments, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the accompanying Utility Model Claims. Anyone who owns it can easily find out.

Claims (2)

A housing 3 constituting an outer body to form a space portion 10 in which the discharge port 11 and the supercharge port 12 communicate with each other, and are inserted and fixed at one end of the housing 3 and communicate holes 22 in the axial direction. The control valve 50 in communication with the union fitting 20 through the union fitting 20 and the communication tube 15 formed therethrough and elastically supported on the opposite side of the union fitting 20 by a valve spring 60. In the flow control valve (1) of the power steering steering pump consisting of a), the wall surface of the housing (3) bore (31) between the rear wall surface of the control valve 50 side and the outlet (33) of the communication tube (15) The through hole 35 is formed in the through hole 35, characterized in that the interior of the noise chamber 39 is fitted with a buffer material 37 fitted in the direction perpendicular to the through hole 35, characterized in that the insertion. Flow control valve for power steering steering pump. The method of claim 1, wherein the noise chamber 39 is a chamber body 41 to form an outer body, a distribution hole 43 is opened in the center of one side of the chamber body 41, the distribution hole 43 and The chamber body 41 is brought into contact with the buffer member 37 inserted into the chamber body 41 inner wall surface with a predetermined clearance 45 so as to face the opposite side of the flow hole 43 of the buffer member 37. A flow regulating valve of a power steering steering pump, characterized in that it is composed of a sealing plate (47) inserted into an outer side of the shock absorbing material (37) on the inner wall surface.